Malicious PDF — malware analysis report

Static analysis result for SHA-256 e544b0fb34419eaa…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 23:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70bec02fa3fdf1de2513e11cec8bf187 SHA-1: cb4a9afce49180fffff13478800752cb399b22ec SHA-256: e544b0fb34419eaaf1de306cfd70d7b8105b1e7f537ba495c7e5cef74735c306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or phishing pages. The presence of these links suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=show+sport+tv+apk+2021 PDF link annotation
    • https://noelex22.org/userfiles/file/mitorebepuxaxe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nbc5s7pn5q1bieeka3ik013ptk/44385681495.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/58527955404.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/balufuwimu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd36b6708---bokakopexuwowo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tufobuzu.pdfIn PDF document text
    • http://geasit.it/userfiles/files/13938354407.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132629a356b1---55019254549.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134335d8109e---wilevolizogobug.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e5d94b2a76c108ec0a246254d862dd1/43517866768.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/8642134638.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/25966682072.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/jefunakenupofibupipok.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/32753833790.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lemifi.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/67161785994.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6eb7b83e3---gamirojifis.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/53644096679.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xesokale.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/panomadejesipoforegut.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904094615525131.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/24251900241.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfe27205f---76423908019.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 10588 bytes
SHA-256: 85e5cc4d3b3b4346701013dbe8d868e7168dfc9d9778a7d48d573d9e2cd941f0
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 17476 bytes
SHA-256: 59d26da8ada782c93e670b09e4f42e834fffacbf4376a2776d91934c96472b6b
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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